Edistorm is a new site for brainstorming similar to the way Wall Wisher or Pin Dax works. This is done in real-time by the use of stickies. As w/ any "web 2.0" site this incorporates collaboration as a number of users can brainstorm at the same time. Also, the stickies are color coordinated for organization.
I recommend giving Edistorm a try by clicking here.
For a much more detailed review, check out the excellent blog iLearn Technology!